Emery wheel dressing tool



May 19, 1931. c. DE MATTIA EMERY WHEEL DRESSING TOOL Filed Aug. l2 19302 Sheets-Sheet l Inventor Attorney y 1931- 0. DE MATTIA 1,805,514

' EMERY WHEEL DRESSING TOOL Filed Aug. 12. 19 0 2 Sheets-Sheet 2 IIIIHIIT III! Inventor WA mm By fiyziwm A tlor ne y Patented May 19, 1931(UNITED- STATES" i,s05,s14

CONSTANT DE MAT'IIA, or DETROIT, MICHIGAN, ssreu'on. To VINCENT STIEEL:time ESS COMPANY, or DETROIT, MICHIGAN; A oonronarrrorr or MICHIGAN v rEMERY WHEEL nnnssrne Toor;

' Application filed August 12;-19e0. Serial No. 474395.

My invention relates to a tool for'dre'ssing I the surface of emery or.other grinding wheels, shown in the accompanying drawings and moreparticularly described in the following specification and claim.

One of the objects of the present invention is to provide a unitarycutting or tooling element comprising a plurality of annular discshaving sharp V-shaped peripheral teeth grouped in staggered relation andsecured together to form a unitary device ofsuitable width and diameter.

-A further object of the invention is the- 'means employed for mountingthe cutting or dressing-tool element upon an arbor extending through theannular discs fitted with sleeves in which are housed anti-frictionbearcombination and arrangement ofparts and in the details ofconstruction hereinafter described and claimed, it being understoodthatchanges may be made inthe precise embodiment of the invention hereinshown without departing from the spirit of the same.

In the drawings accompanying this speci-- fication: I

Figure 1 is an elevation of the unit mounted in the yoke-shaped end of asupporting arm. 7

Figure 2 is a longitudinal cross-sectional view through the unit mountedin the sup-' porting arm, taken on or about line 22 of Figure 3.

Figure 3 is an end elevation of the yoke shaped supporting arm andcutting unit mounted therein.

Figure 4: is a side elevation of a unit comprising a group of cuttingdiscs riveted together supported upon an arbor, between. the annularsleeves in which the arbor is journaled.

Figure 5 is a side elevation of one of the discs with its 'V-shapedcutting teeth.

' Referring nowto the lettersofireferen c e placed upon thedrawings: 1 vr 1 A denotes a disc having a plurality of sharp V-shaped peripheralteeth A and ase'ries of holes A? for the passage Ofrivets or bolts. Awhereby a plural. number of discsmaybe secured together with their teethin staggered relationseeFigures 3and 1to form a cut ting tool ofsuitable width. I I

The annular; discs A thusgrouped and riveted together are supported uponand between opposing collars B, B, mounted on anarbor C, extendingthrough a central opening A in the discs; The collars B, B are providedwith flanges B overlapping and adapted to gripthe faces of the outerdiscs of the cutting unit, with an annular neck B surrounding the arborC extending through a central opening in a pair of sleeves ortrunnionsD, D in which are housed ball-races forming antifrictionbearings E, E for each end of the, arbor.

The'arbor C has anenlarged polygonal head G atone end, its opposite endbeing threaded to receive a nut G which upon adjustment bearsupon theinner annular element of the ball-race forcing the latter into impingingcontact with the annular neck B of the collars B, B thereby causing theflanges B B of'the collars to bear upon and grip the; outer discs A ofthe cutting unit.

' The sleeves or trunnions D, D are rigidly held in the split hubs F, Fof the yoke-shaped end F of a supporting arm G, in turn mounted insuitable holding means, not shown.

H, H are screw-caps constructed with internally tapering screw-tappedrims adapted to engage the tapering screw-threaded flanges F of thesplit hubs F at the yoke-,

' shaped end of the supporting arm, which:

when adjusted serves to compress the hubs into gripping engagement withthe sleeves D, D, to secure the latter against rotation.

H are. polygonal-shaped heads integral with the caps H, to receive awrench for the. manualadj ustment of the caps upon the split hubs of thearbor bearing.

Having now indicated the several parts by reference letters, theconstruction and operation of the device will be readily understood.

The grindin wheel to be dressed or resurfaced is force while revolvinginto impinging contact with the sharpened teeth of the cutting element,which being rotated though 5 contact therewith cuts away the wornsurface dike grimfing wheel thus quickly restoringits original grindingsurface.

Having thus described my invention, Whatv Irdaim is:

10 A device of the character'desjcribed, comprising a plurality ofannular discs having V-shaped peripheral teeth, means for secursaiddiscs together to form a unit with the teeth of the respective, discs instaggered re- 15 lation; a supporting arbor revolvable with the cuttingdisc, a pair ofsleeves fitted with antifriction hearings, in which thearbor is journaled an arm'having a yoke-shaped end with "figscrew-threaded split hubs to receive go mad grip the sleeves, and capshaving taperin ta screw-threaded flanges engaging a said whereby uponadjustment of the the hubs maybe compressed to grip and hold saidsleeves against rotation. 25 In testimonywhereof, I sign thisspecificahon.

' CONSTANT DE MATTIA.

